mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 08:42:40 +01:00
ce2c01f098
Sometimes small, single line code change hides behind it a complicated story. This is one of those times. If you look at this diff, you may note that this is a case of lfs_dir_fetchmatch not correctly handling a tag that invalidates a callback used to search for some condition, in this case a search for a parent, which is invalidated by a later dir tag overwritting the previous dir pair. But how can this happen? Dir-pair-tags are only overwritten during relocations (when a block goes bad or exceeds the block_cycles config option for dynamic wear-leveling). Other dir operations create new directory entries. And the only lfs_dir_fetchmatch condition that relies on overwrites (as opposed to proper deletes) is when we need to find a directory's parent, an operation that only occurs during a _different_ relocation. And a false _positive_, can only happen if we don't have a parent. Which is really unlikely when we search for directory parents! This bug and minimal test case was found by Matthew Renzelmann. In a unfortunate series of events, first a file creation causes a directory split to occur. This creates a new, orphaned metadata-pair containing our new file. However, the revision count on this metadata-pair indicates the pair is due for relocation as a part of wear-leveling. Normally, this is fine, even though this metadata-pair has no parent, the lfs_dir_find should return ENOENT and continue without error. However, here we get hit by our fetchmatch bug. A previous, unrelated relocation overwrites a pair which just happens to contain the block allocated for a new metadata-pair. When we search for a parent, lfs_dir_fetchmatch incorrectly finds this old, outdated metadata pair and incorrectly tells our orphan it's found its parent. As you can imagine the orphan's dissapointment must be immense. So an unfortunately timed dir split triggers a relocation which incorrectly finds a previously written parent that has been outdated by another relocation. As a solution we can outdate our found tag if it is overwritten by an exact match during lfs_dir_fetchmatch. As a part of this I started adding a new set of tests: tests/test_relocations, for aggressive relocations tests. This is already by appended to by another PR. I suspect relocations is relatively under-tested and is becoming more important due to recent improvements in wear-leveling.
495 lines
14 KiB
Bash
Executable File
495 lines
14 KiB
Bash
Executable File
#!/bin/bash
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set -euE
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export TEST_FILE=$0
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trap 'export TEST_LINE=$LINENO' DEBUG
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echo "=== Allocator tests ==="
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rm -rf blocks
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scripts/test.py << TEST
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lfs_format(&lfs, &cfg) => 0;
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TEST
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SIZE=15000
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lfs_mkdir() {
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_mkdir(&lfs, "$1") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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}
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lfs_remove() {
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_remove(&lfs, "$1/eggs") => 0;
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lfs_remove(&lfs, "$1/bacon") => 0;
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lfs_remove(&lfs, "$1/pancakes") => 0;
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lfs_remove(&lfs, "$1") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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}
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lfs_alloc_singleproc() {
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scripts/test.py << TEST
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const char *names[] = {"bacon", "eggs", "pancakes"};
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lfs_file_t files[sizeof(names)/sizeof(names[0])];
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lfs_mount(&lfs, &cfg) => 0;
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for (unsigned n = 0; n < sizeof(names)/sizeof(names[0]); n++) {
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sprintf(path, "$1/%s", names[n]);
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lfs_file_open(&lfs, &files[n], path,
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_APPEND) => 0;
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}
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for (unsigned n = 0; n < sizeof(names)/sizeof(names[0]); n++) {
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lfs_size_t size = strlen(names[n]);
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for (int i = 0; i < $SIZE; i++) {
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lfs_file_write(&lfs, &files[n], names[n], size) => size;
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}
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}
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for (unsigned n = 0; n < sizeof(names)/sizeof(names[0]); n++) {
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lfs_file_close(&lfs, &files[n]) => 0;
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}
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lfs_unmount(&lfs) => 0;
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TEST
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}
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lfs_alloc_multiproc() {
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for name in bacon eggs pancakes
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do
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "$1/$name",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_APPEND) => 0;
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lfs_size_t size = strlen("$name");
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memcpy(buffer, "$name", size);
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for (int i = 0; i < $SIZE; i++) {
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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done
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}
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lfs_verify() {
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for name in bacon eggs pancakes
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do
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "$1/$name", LFS_O_RDONLY) => 0;
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lfs_size_t size = strlen("$name");
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for (int i = 0; i < $SIZE; i++) {
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "$name", size) => 0;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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done
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}
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echo "--- Single-process allocation test ---"
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lfs_mkdir singleproc
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lfs_alloc_singleproc singleproc
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lfs_verify singleproc
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echo "--- Multi-process allocation test ---"
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lfs_mkdir multiproc
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lfs_alloc_multiproc multiproc
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lfs_verify multiproc
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lfs_verify singleproc
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echo "--- Single-process reuse test ---"
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lfs_remove singleproc
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lfs_mkdir singleprocreuse
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lfs_alloc_singleproc singleprocreuse
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lfs_verify singleprocreuse
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lfs_verify multiproc
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echo "--- Multi-process reuse test ---"
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lfs_remove multiproc
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lfs_mkdir multiprocreuse
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lfs_alloc_singleproc multiprocreuse
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lfs_verify multiprocreuse
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lfs_verify singleprocreuse
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echo "--- Cleanup ---"
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lfs_remove multiprocreuse
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lfs_remove singleprocreuse
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echo "--- Exhaustion test ---"
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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lfs_size_t size = strlen("exhaustion");
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memcpy(buffer, "exhaustion", size);
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lfs_file_write(&lfs, &file, buffer, size) => size;
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lfs_file_sync(&lfs, &file) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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lfs_ssize_t res;
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while (true) {
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res = lfs_file_write(&lfs, &file, buffer, size);
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if (res < 0) {
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break;
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}
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res => size;
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}
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res => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_RDONLY);
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lfs_size_t size = strlen("exhaustion");
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lfs_file_size(&lfs, &file) => size;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "exhaustion", size) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Exhaustion wraparound test ---"
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_file_open(&lfs, &file, "padding", LFS_O_WRONLY | LFS_O_CREAT);
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lfs_size_t size = strlen("buffering");
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memcpy(buffer, "buffering", size);
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for (int i = 0; i < $SIZE; i++) {
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_remove(&lfs, "padding") => 0;
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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size = strlen("exhaustion");
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memcpy(buffer, "exhaustion", size);
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lfs_file_write(&lfs, &file, buffer, size) => size;
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lfs_file_sync(&lfs, &file) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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lfs_ssize_t res;
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while (true) {
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res = lfs_file_write(&lfs, &file, buffer, size);
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if (res < 0) {
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break;
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}
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res => size;
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}
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res => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_RDONLY);
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lfs_size_t size = strlen("exhaustion");
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lfs_file_size(&lfs, &file) => size;
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lfs_file_read(&lfs, &file, buffer, size) => size;
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memcmp(buffer, "exhaustion", size) => 0;
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lfs_file_close(&lfs, &file) => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Dir exhaustion test ---"
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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// find out max file size
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lfs_mkdir(&lfs, "exhaustiondir") => 0;
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lfs_size_t size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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int count = 0;
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int err;
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while (true) {
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err = lfs_file_write(&lfs, &file, buffer, size);
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if (err < 0) {
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break;
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}
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count += 1;
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}
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err => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file) => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_remove(&lfs, "exhaustiondir") => 0;
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// see if dir fits with max file size
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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for (int i = 0; i < count; i++) {
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_mkdir(&lfs, "exhaustiondir") => 0;
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lfs_remove(&lfs, "exhaustiondir") => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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// see if dir fits with > max file size
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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for (int i = 0; i < count+1; i++) {
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_mkdir(&lfs, "exhaustiondir") => LFS_ERR_NOSPC;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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## Below, these tests depend _very_ heavily on the geometry of the
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## block device being tested, they should be removed and replaced
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## by generalized tests. For now we'll just skip if the geometry
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## is customized.
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if [[ ! $MAKEFLAGS =~ "LFS_BLOCK_CYCLES" ]]
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then
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echo "--- Chained dir exhaustion test ---"
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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// find out max file size
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lfs_mkdir(&lfs, "exhaustiondir") => 0;
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for (int i = 0; i < 10; i++) {
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sprintf(path, "dirwithanexhaustivelylongnameforpadding%d", i);
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lfs_mkdir(&lfs, path) => 0;
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}
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lfs_size_t size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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int count = 0;
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int err;
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while (true) {
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err = lfs_file_write(&lfs, &file, buffer, size);
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if (err < 0) {
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break;
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}
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count += 1;
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}
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err => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file) => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_remove(&lfs, "exhaustiondir") => 0;
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for (int i = 0; i < 10; i++) {
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sprintf(path, "dirwithanexhaustivelylongnameforpadding%d", i);
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lfs_remove(&lfs, path) => 0;
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}
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// see that chained dir fails
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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for (int i = 0; i < count+1; i++) {
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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lfs_file_sync(&lfs, &file) => 0;
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for (int i = 0; i < 10; i++) {
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sprintf(path, "dirwithanexhaustivelylongnameforpadding%d", i);
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lfs_mkdir(&lfs, path) => 0;
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}
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lfs_mkdir(&lfs, "exhaustiondir") => LFS_ERR_NOSPC;
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// shorten file to try a second chained dir
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while (true) {
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err = lfs_mkdir(&lfs, "exhaustiondir");
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if (err != LFS_ERR_NOSPC) {
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break;
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}
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lfs_ssize_t filesize = lfs_file_size(&lfs, &file);
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filesize > 0 => true;
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lfs_file_truncate(&lfs, &file, filesize - size) => 0;
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lfs_file_sync(&lfs, &file) => 0;
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}
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err => 0;
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lfs_mkdir(&lfs, "exhaustiondir2") => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Split dir test ---"
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scripts/test.py << TEST
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lfs_format(&lfs, &cfg) => 0;
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TEST
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scripts/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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// create one block hole for half a directory
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lfs_file_open(&lfs, &file, "bump", LFS_O_WRONLY | LFS_O_CREAT) => 0;
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for (lfs_size_t i = 0; i < cfg.block_size; i += 2) {
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memcpy(&buffer[i], "hi", 2);
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}
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lfs_file_write(&lfs, &file, buffer, cfg.block_size) => cfg.block_size;
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lfs_file_close(&lfs, &file) => 0;
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lfs_file_open(&lfs, &file, "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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lfs_size_t size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < (cfg.block_count-4)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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lfs_file_close(&lfs, &file) => 0;
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// remount to force reset of lookahead
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lfs_unmount(&lfs) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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// open hole
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lfs_remove(&lfs, "bump") => 0;
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lfs_mkdir(&lfs, "splitdir") => 0;
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lfs_file_open(&lfs, &file, "splitdir/bump",
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LFS_O_WRONLY | LFS_O_CREAT) => 0;
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for (lfs_size_t i = 0; i < cfg.block_size; i += 2) {
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memcpy(&buffer[i], "hi", 2);
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}
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lfs_file_write(&lfs, &file, buffer, 2*cfg.block_size) => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Outdated lookahead test ---"
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scripts/test.py << TEST
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lfs_format(&lfs, &cfg) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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// fill completely with two files
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lfs_file_open(&lfs, &file, "exhaustion1",
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LFS_O_WRONLY | LFS_O_CREAT) => 0;
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lfs_size_t size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2)/2)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_file_open(&lfs, &file, "exhaustion2",
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LFS_O_WRONLY | LFS_O_CREAT) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2+1)/2)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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lfs_file_close(&lfs, &file) => 0;
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// remount to force reset of lookahead
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lfs_unmount(&lfs) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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// rewrite one file
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lfs_file_open(&lfs, &file, "exhaustion1",
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LFS_O_WRONLY | LFS_O_TRUNC) => 0;
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lfs_file_sync(&lfs, &file) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2)/2)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file, buffer, size) => size;
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}
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lfs_file_close(&lfs, &file) => 0;
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// rewrite second file, this requires lookahead does not
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// use old population
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lfs_file_open(&lfs, &file, "exhaustion2",
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LFS_O_WRONLY | LFS_O_TRUNC) => 0;
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lfs_file_sync(&lfs, &file) => 0;
|
|
size = strlen("blahblahblahblah");
|
|
memcpy(buffer, "blahblahblahblah", size);
|
|
for (lfs_size_t i = 0;
|
|
i < ((cfg.block_count-2+1)/2)*(cfg.block_size-8);
|
|
i += size) {
|
|
lfs_file_write(&lfs, &file, buffer, size) => size;
|
|
}
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
TEST
|
|
|
|
echo "--- Outdated lookahead and split dir test ---"
|
|
scripts/test.py << TEST
|
|
lfs_format(&lfs, &cfg) => 0;
|
|
|
|
lfs_mount(&lfs, &cfg) => 0;
|
|
|
|
// fill completely with two files
|
|
lfs_file_open(&lfs, &file, "exhaustion1",
|
|
LFS_O_WRONLY | LFS_O_CREAT) => 0;
|
|
lfs_size_t size = strlen("blahblahblahblah");
|
|
memcpy(buffer, "blahblahblahblah", size);
|
|
for (lfs_size_t i = 0;
|
|
i < ((cfg.block_count-2)/2)*(cfg.block_size-8);
|
|
i += size) {
|
|
lfs_file_write(&lfs, &file, buffer, size) => size;
|
|
}
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
|
|
lfs_file_open(&lfs, &file, "exhaustion2",
|
|
LFS_O_WRONLY | LFS_O_CREAT) => 0;
|
|
size = strlen("blahblahblahblah");
|
|
memcpy(buffer, "blahblahblahblah", size);
|
|
for (lfs_size_t i = 0;
|
|
i < ((cfg.block_count-2+1)/2)*(cfg.block_size-8);
|
|
i += size) {
|
|
lfs_file_write(&lfs, &file, buffer, size) => size;
|
|
}
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
|
|
// remount to force reset of lookahead
|
|
lfs_unmount(&lfs) => 0;
|
|
lfs_mount(&lfs, &cfg) => 0;
|
|
|
|
// rewrite one file with a hole of one block
|
|
lfs_file_open(&lfs, &file, "exhaustion1",
|
|
LFS_O_WRONLY | LFS_O_TRUNC) => 0;
|
|
lfs_file_sync(&lfs, &file) => 0;
|
|
size = strlen("blahblahblahblah");
|
|
memcpy(buffer, "blahblahblahblah", size);
|
|
for (lfs_size_t i = 0;
|
|
i < ((cfg.block_count-2)/2 - 1)*(cfg.block_size-8);
|
|
i += size) {
|
|
lfs_file_write(&lfs, &file, buffer, size) => size;
|
|
}
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
|
|
// try to allocate a directory, should fail!
|
|
lfs_mkdir(&lfs, "split") => LFS_ERR_NOSPC;
|
|
|
|
// file should not fail
|
|
lfs_file_open(&lfs, &file, "notasplit",
|
|
LFS_O_WRONLY | LFS_O_CREAT) => 0;
|
|
lfs_file_write(&lfs, &file, "hi", 2) => 2;
|
|
lfs_file_close(&lfs, &file) => 0;
|
|
|
|
lfs_unmount(&lfs) => 0;
|
|
TEST
|
|
|
|
fi
|
|
|
|
scripts/results.py
|